After age 20, you produce less collagen every year. As collagen production decreases, the skin becomes thinner and less elastic. The lips, which are typically puffy during youth, become noticeably deflated as you age.

Aging skin also produces less oil, which can lead to chronic dryness. The lips are particularly prone to dryness.

The other major cause of lip lines is sun exposure. The skin on your lips is very delicate and often goes unprotected. Exposure to the sun’s ultraviolet rays is the primary cause of premature aging. This process is called photoaging.

Lip wrinkles on the upper lip can also be caused by smoking. Smoking produces free radicals in the body, which contribute to premature aging. It’s also possible that the repetitive motion of a drag could contribute to lip wrinkles.

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